Let A ⊂ R^n , prove that the boundary of A (∂A) is a closed set. HINT: Who is the complement of ∂A? Write this complemen
Posted: Wed May 11, 2022 9:42 pm
Let A ⊂ R^n , prove that the boundary of A (∂A) is a closed
set.
HINT: Who is the complement of ∂A? Write this complement as the
disjoint union of two known sets and use the definition of each of
them.
set.
HINT: Who is the complement of ∂A? Write this complement as the
disjoint union of two known sets and use the definition of each of
them.